21605975

素因数分解:

$5^2\times {\mathrm{41}}^1\times {\mathrm{107}}^1\times {\mathrm{197}}^1$

素因数の和:355

約数の個数: 24

約数和(自身を含む): 27841968

約数和(自身を除く): 6235993

約数列:

[1, 5, 25, 41, 107, 197, 205, 535, 985, 1025, 2675, 4387, 4925, 8077, 21079, 21935, 40385, 105395, 109675, 201925, 526975, 864239, 4321195, 21605975]

約数ペア:

[(1, 21605975), (5, 4321195), (25, 864239), (41, 526975), (107, 201925), (197, 109675), (205, 105395), (535, 40385), (985, 21935), (1025, 21079), (2675, 8077), (4387, 4925)]